Answer:
The triangles are similar by SSS.
Explanation:
We only have the sides of the triangles. Therefore, we can decide if the triangles are similar only by SSS.
If triangles are similar, then corresponding sides make proportion.
We have (let's set the sides in ascending order):
triangle 1: 30, 42 and 51
triangle 2: 10, 14 and 17.
Check:
30 : 10 =3
42 : 14 = 3
51 : 17 = 3
correct